US4145627A - Crimped seal piezoelectric resonator package - Google Patents

Crimped seal piezoelectric resonator package Download PDF

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Publication number
US4145627A
US4145627A US05/772,148 US77214877A US4145627A US 4145627 A US4145627 A US 4145627A US 77214877 A US77214877 A US 77214877A US 4145627 A US4145627 A US 4145627A
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US
United States
Prior art keywords
case
resonator
caps
end portion
tubular
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US05/772,148
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English (en)
Inventor
Tadao Ishizawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seiko Instruments Inc
Original Assignee
Seiko Instruments Inc
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Filing date
Publication date
Application filed by Seiko Instruments Inc filed Critical Seiko Instruments Inc
Application granted granted Critical
Publication of US4145627A publication Critical patent/US4145627A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
    • H03H9/02—Details
    • H03H9/05—Holders or supports
    • H03H9/10—Mounting in enclosures
    • H03H9/1007—Mounting in enclosures for bulk acoustic wave [BAW] devices
    • H03H9/1014—Mounting in enclosures for bulk acoustic wave [BAW] devices the enclosure being defined by a frame built on a substrate and a cap, the frame having no mechanical contact with the BAW device

Definitions

  • the present invention relates to packaging of piezoelectric resonators and in particular the packaging of miniature resonators suitable for watches and the like.
  • a piezoelectric resonator element such as quartz is generally packaged in a vacuum casing in order to avoid any external forces or atmospheric influence that might affect vibration of the resonator.
  • a conventional resonator comprises a quartz fork packaged in a metal case. The quartz fork has a pair of parallel lead wires which extend through a glass base which is fixed airtightly in one end of the case.
  • a resonator packaging of this kind has the fault that if used for a micro resonator the lead wires are apt to touch one another because the gap between them is too small. Moreover the assembling of a resonator packaging of this kind in a watch requires much time because the fine lead wires are easily bent.
  • a resonator element in a metal case comprising a flanged trough-like vessel having two holes in its bottom near the ends.
  • the resonator element is provided at opposite ends with lead wires which extend laterally through insulating bases fixed in the holes in the bottom of the vessel.
  • the vessel is then covered with a flanged cover which is welded on in a high vacuum to seal the case.
  • the lead wires are sufficiently spaced.
  • the flange area around the vessel body is large in relation to the space inside the vessel so that it is not possible to miniaturize the packaging beyond a limit.
  • it is difficult to obtain a high vacuum in the case because of gas generation from the pressure welding of the flanges.
  • a resonator having supporting lead members projecting in opposite directions therefrom is positioned in a tubular dielectric case having an electrically conductive end cap at each end thereof.
  • Each of the caps has a tubular inner end portion sealed to the dielectric case, an intermediate portion into which the respective lead member of the resonator extends and an outer end portion which extends beyond the end of the respective lead member.
  • the intermediate portions of the end caps are pressed inwardly onto the respective lead members so as to securely grip and hold the lead members and to make electrical contact therewith while at the same time closing the case.
  • the case is further sealed by caulking or cold welding the outer end portions of the cap members. If desired the ends of the cap members can thereafter be soldered or heat welded to provide still further assurance of a perfect seal.
  • the sealing is effected under a high vacuum in order to evacuate the interior of the case.
  • FIG. 1 is a longitudinal sectional view showing a conventional resonator packaging
  • FIG. 2 is a longitudinal sectional view showing another type of conventional resonator packaging
  • FIG. 3 is a longitudinal sectional view of a dielectric case and conductive cap members affixed at opposite ends thereof for packaging a resonator in accordance with the invention
  • FIG. 4 is a longitudinal sectional view showing a completed resonator packaging in accordance with the invention.
  • FIG. 5 is an end view of the resonator packaging shown in FIG. 4;
  • FIG. 6 is a side view of the resonator packaging taken at right angles to FIG. 4 and
  • FIG. 7 is a front view showing a fork-type resonator provided with lead members for packaging in accordance with the invention.
  • FIG. 1 there is shown a conventional resonator packaging in which a glass base 1 has a pair of lead wires 2a and 2b extending therethrough. An end of each lead wire is electrically and mechanically connected with the base of quartz fork 3. The glass base 1 with the quartz fork 3 thus mounted thereon is then inserted into the open end of a tubular metal case 4 having a closed end 4a and is hermetically sealed in the case by sealing material 5. The sealing is effected in a vacuum so as to evacuate the interior of the case.
  • a resonator packaging of the kind shown in FIG. 1 has the fault when used for micro resonators that the lead wires 2a and 2b are apt to touch one another because the gap between is too small. Moreover the assembly of a resonator packaging of this kind in a watch requires much time and great care because the fine lead wires are easily bent.
  • FIG. 2 there is shown another conventional resonator packaging in which a metal case comprises a trough-like vessel 10 having a peripheral flange 10a and a dished cover 14 having a peripheral flange 14a.
  • the vessel 10 is provided near its ends with flanged openings 10b in which bases 12 of glass are other insulated material are fitted.
  • a quartz resonator 13 is provided at opposite ends with lead wires 11a and 11b which are bent so as to extend laterally of the resonator through the respective bases 12 in the openings 10b of the vessel 10.
  • the resonator packaging shown in FIG. 2 has the advantage over that of FIG. 1 in that the distance between the lead wires is large enough to permit easy connection with external circuitry.
  • the resonator packaging of FIG. 2 has the disadvantage that the flange area around the casing is large relative to the sealed enclosure so that it is impossible to miniaturize the packaging beyond a certain limit. Moreover it is difficult to keep a high vacuum in the enclosure because of gas generation from the flanges during pressure welding.
  • a piezoelectric resonator is packaged in a tubular dielectric case 20 illustrated in FIG. 3.
  • the tubular case 20 is preferably made of a material such as Kover glass including an Fe-Ni-Co alloy.
  • a pair of tubular conductive end caps 21 are respectively fitted to the opposite ends of the tubular dielectric case 20 and project beyond the ends of the case as seen in FIG. 3.
  • the caps 21 are preferably made of a plastic metal such as Kover (Fe-Ni-Co alloy) if the case 20 is made of Kover glass. In any case it is advantageous to select materials having substantially equal thermal expansion coefficient for the case 20 and caps 21.
  • the end caps are hermetically sealed to the tubular case 20 by first oxidizing the outer surfaces of the end caps, inserting the end caps a predetermined distance into the ends of the tubular case 20 and then heating both ends of the tubular case to melt and shrink the glass to obtain a hermetic seal between the case and the end caps.
  • the caps 21 are not only for hermetically closing the case but are used to position and support a resonator in the case and serve as the outer terminals of the resonator as will be described below.
  • FIGS. 4, 5 and 6 show a completed resonator packaging comprising a resonator 22 suspended within the sealed case.
  • the resonator 22 may be an AT-cut oblong strip quartz resonator for thickness shear type oscillation.
  • the resonator is provided with a pair of plate type or fine bar type supporting lead members 23 which extend longitudinally from opposite ends of the resonator 22. These lead members 23 support the resonator 22 in the case 20 and electrically connect the electrodes of the resonator with respective end caps 21.
  • Each of the end caps 21 has a tubular inner end portion 21c which is fixed to the respective end of the dielectric case 20 so as to provide a hermetic seal between the end cap and the case.
  • the lead members 23 of the resonator 22 extend into intermediate portions 21a of the end caps 21 which project beyond the ends of the dielectric case 20 and which are caulked or cold welded onto the lead members 23 with high pressure.
  • the ends of the case are thereby closed and the lead members 23 are securely held so as to suspend the resonator 22 in a desired position in the case.
  • the lead members 23 are thereby electrically connected with the conductive end caps 21 so that the latter serve as external terminals for the resonator.
  • tip portions 21b of the end caps 21 extend beyond the ends of the lead members 23 and are caulked or cold welded with high pressure further to seal the packaging.
  • the outer portions 21b serve as convenient outer terminals for connecting the resonator into an oscillating circuit.
  • the lead members 23 are preferably inserted into holes which have been previously made in the resonator 22 and are securely fixed with solder or conductive adhesive.
  • This assembly of the resonator 22 and lead members 23 is placed in the dielectric tubular case 20 having tubular end caps 21 fixed thereto as illustrated in FIG. 3.
  • the case 20 is of a diameter to receive the resonator 22 with suitable clearance and of such length that the lead members 23 of the resonator 22 extend into intermediate portions 21a of the end caps.
  • the end caps are then caulked or cold welded to hermetically close the case and to secure the resonator in selected position in the case.
  • the resonator is not limited to an AT-cut quartz resonator but that the invention is also applicable in packaging other piezoelectric resonator elements.
  • a fork type resonator 32 which may be packaged in accordance with the invention.
  • the resonator 32 has a pair of lead bars 33a and 33b which are fixed to opposite faces of the case or base portion thereof and extend longitudinally in opposite directions from the resonator. These lead bars 33a and 33b are received in the conductive end caps 21 at opposite ends of the dielectric case 20 as described above to support and position the resonator in the case and to provide electrical connection to the conductive end caps which serve as external terminals for the resonator.
  • a fork type resonator it is advantageous to use a case and end caps of oval cross section in order to accommodate the resonator with suitable clearance while keeping the volume of the enclosure and the overall size of the packaged resonator as small as possible.

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
  • Dental Preparations (AREA)
US05/772,148 1976-02-25 1977-02-25 Crimped seal piezoelectric resonator package Expired - Lifetime US4145627A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1955676A JPS52102694A (en) 1976-02-25 1976-02-25 Vibrator
JP51-19556 1976-02-25

Publications (1)

Publication Number Publication Date
US4145627A true US4145627A (en) 1979-03-20

Family

ID=12002580

Family Applications (1)

Application Number Title Priority Date Filing Date
US05/772,148 Expired - Lifetime US4145627A (en) 1976-02-25 1977-02-25 Crimped seal piezoelectric resonator package

Country Status (4)

Country Link
US (1) US4145627A (enrdf_load_stackoverflow)
JP (1) JPS52102694A (enrdf_load_stackoverflow)
CH (1) CH615566B (enrdf_load_stackoverflow)
GB (1) GB1545157A (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4485325A (en) * 1982-03-04 1984-11-27 Murata Manufacturing Co., Ltd. Housing and mounting for a chip-like piezoelectric vibrator component
US4542315A (en) * 1984-05-15 1985-09-17 Murata Manufacturing Co., Ltd. Chip-shaped piezoelectric vibrator mount
US4899076A (en) * 1987-03-06 1990-02-06 Citizen Watch Co., Ltd. Piezoelectric oscillator
US20050263878A1 (en) * 2004-05-28 2005-12-01 Stellar Microdevices, Inc. Cold weld hermetic MEMS package and method of manufacture
US20060115323A1 (en) * 2004-11-04 2006-06-01 Coppeta Jonathan R Compression and cold weld sealing methods and devices
CN112202416A (zh) * 2020-10-26 2021-01-08 林东 石英谐振器结构及其制作方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63196114U (enrdf_load_stackoverflow) * 1987-06-05 1988-12-16

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2341683A (en) * 1942-04-20 1944-02-15 Bendix Aviat Corp Piezoelectric crystal holder
US2395034A (en) * 1943-06-08 1946-02-19 Standard Telephones Cables Ltd Cartridge crystal holder
US2488781A (en) * 1945-09-28 1949-11-22 Reeves Hoffman Corp Crystal holder

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2341683A (en) * 1942-04-20 1944-02-15 Bendix Aviat Corp Piezoelectric crystal holder
US2395034A (en) * 1943-06-08 1946-02-19 Standard Telephones Cables Ltd Cartridge crystal holder
US2488781A (en) * 1945-09-28 1949-11-22 Reeves Hoffman Corp Crystal holder

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4485325A (en) * 1982-03-04 1984-11-27 Murata Manufacturing Co., Ltd. Housing and mounting for a chip-like piezoelectric vibrator component
US4542315A (en) * 1984-05-15 1985-09-17 Murata Manufacturing Co., Ltd. Chip-shaped piezoelectric vibrator mount
US4899076A (en) * 1987-03-06 1990-02-06 Citizen Watch Co., Ltd. Piezoelectric oscillator
US20050263878A1 (en) * 2004-05-28 2005-12-01 Stellar Microdevices, Inc. Cold weld hermetic MEMS package and method of manufacture
US7576427B2 (en) * 2004-05-28 2009-08-18 Stellar Micro Devices Cold weld hermetic MEMS package and method of manufacture
US20060115323A1 (en) * 2004-11-04 2006-06-01 Coppeta Jonathan R Compression and cold weld sealing methods and devices
US8191756B2 (en) 2004-11-04 2012-06-05 Microchips, Inc. Hermetically sealing using a cold welded tongue and groove structure
US9796583B2 (en) 2004-11-04 2017-10-24 Microchips Biotech, Inc. Compression and cold weld sealing method for an electrical via connection
CN112202416A (zh) * 2020-10-26 2021-01-08 林东 石英谐振器结构及其制作方法

Also Published As

Publication number Publication date
CH615566GA3 (enrdf_load_stackoverflow) 1980-02-15
GB1545157A (en) 1979-05-02
CH615566B (de)
JPS52102694A (en) 1977-08-29

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